Top Features of the Shimano XTR M980 HollowTech II Bottom Bracket Cups

Light weight seal structure helps to remove vital grams

Sealed cups keep out dirt and water

Maintenance free

Compatible with 68 mm and 73 mm shell

Durable black anodised finish

Easy installation

Fits M980 and M985 chainsets

Also referred to as the SM-BB93

Product Data

MTB:

Yes

Road:

Yes

About Bottom Brackets

Bicycle bottom brackets connect the cranks to the bike and allow the crank arms to rotate. There are various sizes of bottom bracket shell on the market, so compatibility needs to be checked. The three most common frame bottom bracket shell widths are 68mm (English threaded road and mtb), 70mm (Italian threaded road) and 73mm (British threaded mtb). There are also many axle shapes and styles, from JIS or ISO square tapers through to the round splined axles such as ISIS or Octalink and then there is the new external cup systems which have the axle built into the crank arms. Some frames are now using the new BB30 system which uses bearings pushed directly into the frame and removes the needs for cups to be threaded into the frame.

About the Shimano brand

Shimano are the makers of the world's most well known cycle component brand. Established in 1921 when the first cycle freewheel was forged. Shimano produce drivetrains, wheels, pedals, shoes, cycling clothing and pretty much every Shimano cycle accessory you can think of! Famous for their top end products ridden by the pro's, Dura-Ace and XTR, which cover both road and MTB's. At Shimano, they're doing everything they can to respond to heightened environmental concerns.
Shimano are proud to be a producer of bicycle components that help people to enjoy outdoor sports and interact with nature through healthy non-polluting activities. In their 87 plus years of existence Shimano have accumulated a wealth of technology and product development and expertise that serves as the driving force behind their continually evolving product line.

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Rated 5 out of
5 by
HalibutSurfer from
Nice upgradeUpgraded after the old BB seized. Hopefully this one will last a bit longer

Date published: 2018-03-16

Rated 5 out of
5 by
mark385 from
Great productReplaced my old XTR Bottom Bracket. Very simple to replace.

Date published: 2017-05-24

Rated 5 out of
5 by
PaulPaulPaul from
Really good - light weight and good priceEasy to fit. Use the supplied tool together with a Shimano bottom bracket spanner and its really easy.
Feels smooth as butter when spinning the crank.

Date published: 2016-02-05

Rated 5 out of
5 by
Sportive1965 from
Smooooooooth!Banish those creaky cranks with this delightful piece of Shimano engineering. To say it's from the top end groupset the price is an absolute bargain. Definitely runs smoother than lower group bottom brackets, and that's a compliment as they aren't too shabby either.
Some strange comments about the fitting of this. Yes, it's smaller in diameter than the normal Shimano BB but comes with an adapter that fits into the fitting tool no problem. Cranks off, old BB off, new on and cranks back on in ten minutes, including drinking mandatory tea!!
Longevity remains to be seen but never had a problem with other Shimano stuff so can't see this being any different.

Tool adaptor

I note that the Dura Ace bb requires the adaptor to work with the Park Tool you reccomend above Andy E ( see the last post from Wiggle on the tool Q and A). I believe this is the same - does it come with the adaptor in the bb kit:?
I have the Park tool but believe an adaptor is needed for this one

Asked by: Mrbaker2u

An adaptor should be supplied in the box with the BB.

Answered by: WigglePaul

Date published: 2014-11-01

Does this come with the required tool

Hi does this come with the specific XTR BB fitting tool? I understand the teeth are smaller than standard HTII?
If not can you share a link to the tool ?
Thanks

Asked by: Mrbaker2u

This does not come with the fitting tool however the Park Tools Hollowtech II BB And Crank Arm Tool should work with these cups without issue.

Answered by: WiggleAndyE

Date published: 2017-08-03

bottom bracket

good evening
would this be a decent replacement for my present shimano BB51 ?

Asked by: NickHar

I can confirm that this would be a suitable upgrade from the BB51.
I hope this helps.

Answered by: WiggleWarby

Date published: 2015-02-12

Shimano bb51

Just removed a very old and warn bb 51 bottom bracket. Will this fit as an upgraded replacement?

Asked by: Matty4321

Yes, I can confirm that this would be a suitable replacement bottom bracket.

Answered by: WiggleDonat

Date published: 2017-10-23

Will this bottom bracket work with a Shimano Alfine chainset?

Asked by: JMartin

Alfine chainsets are Hollowtech 2 so this will indeed be compatible.

Answered by: Leftleg

Date published: 2015-01-12

Is this BB compatible with the FC-M590 Deore 9-Speed chain set?

Asked by: DanDareOnWheels

Unfortunately not, we would recommend:

Answered by: WiggleKris

Date published: 2018-01-10

Does this include bearings?

The product listing makes no reference to bearings being included with this item. Does it include bearings? If not please advise what size and dimensions the bearings need to have in order to fit this.

Asked by: bell1975

Bearings will be included. Hope this clears up any confusion.

Answered by: WiggleJT

Date published: 2016-12-06

Replacement for SM-BB70?

I've worn out two SM-BB70 after about 2000 road touring miles each. Would the XTR M980 be a compatible replacement for a SM-BB70? Also, is it likely to last longer?
Cheers, Richard

Asked by: handwheels

Yes. I remplace my old bb50 with it.

Answered by: donniecp

Date published: 2015-09-06

Will this be compatible with an FSA 368 Chainset ?

Thinking of Swapping out an FSA Megaexo BB for Shimano Xtr M980 but unsure of compatibility for FSA Comet 368 Chainset.

Asked by: GerryT61

This is compatible with 68 mm and 73 mm shells and M980 and M985 chainsets.

Answered by: WiggleKing

Date published: 2015-09-18

Hi, would this shimano hollow tech 2 be a decent replacement for my bb90?

Asked by: Dave600

Unfortunately without the correct adapters to convert BB90 to threaded type bottom brackets I'm afraid this would not be compatible.